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21995 (1999 XL29)
Classification: Main-belt Asteroid          SPK-ID: 2021995
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1274852161191883 2.7386e-08  
a 2.54478524063883 9.6531e-09 au
q 2.220362744259068 7.1304e-08 au
i 6.708740959674062 3.8787e-06 deg
node 103.2067547809851 2.626e-05 deg
peri 133.2909799650755 3.1091e-05 deg
M 258.5483116984428 1.7734e-05 deg
tp 2459618.361068752149
(2022-Feb-07.86106875)		 7.3785e-05 TDB
period 1482.774582357195
4.06		 8.4369e-06
2.31e-08		 d
yr
n .2427880840981919 1.3815e-09 deg/d
Q 2.869207737018592 1.0884e-08 au
   Orbit Determination Parameters
   # obs. used (total)      1828  
   data-arc span      8788 days (24.06 yr)  
   first obs. used      1997-02-20  
   last obs. used      2021-03-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49674  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:57:14  

Additional Information
 Earth MOID = 1.21298 au 
 Jupiter MOID = 2.14917 au 
 T_jup = 3.422 
[ show covariance matrix ]

[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.4   n/a MPO502329  
diameter diameter 4.194 km 0.226 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.230   0.048 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21995 (1999 XL29)          Discovered 1999-Dec-06 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 XL29 = 1997 DS = 1998 QO30 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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